n. phr. , informal Something difficult to understand or to do. Tom's algebra lesson was a hard nut to crack. Mary found knitting a hard nut to crack.
Compare: HARD ROW TO HOE.
n. phr. , informal Something difficult to understand or to do. Tom's algebra lesson was a hard nut to crack. Mary found knitting a hard nut to crack.
Compare: HARD ROW TO HOE.
American idioms English vocabulary. Английский словарь американских идиом. 2012